Athens

The 5.1 magnitude earthquake had an epicentre about 22km (14 miles) north-west of Athens.

Athenians ran out into the streets as the city shook for 15 seconds.

There were no reports of serious injuries, but several aftershocks have been felt and two buildings have collapsed.

The strongest aftershock had a magnitude of 4.3, almost an hour after the initial quake hit at 14:13 (11:13 GMT). Seismologists warn there could be more.

The mayors of Paris, Mexico City, Madrid and Athens say they are implementing the ban to improve air quality.

They say they will give incentives for alternative vehicle use and promote walking and cycling.

The commitments were made in Mexico at a biennial meeting of city leaders.